Hi,
I have a question on netpoll and I think it is a good opportunity to ask my question in this thread,
I have always wondered what is the use cases of netpoll anyway?
Some months ago, I was designing a caching mechanism within the network stack. I was just polling in NF_IP_PRE_ROUTING and check some keys in my hash map if it is HIT then I will respond to the incoming request from the kernel via NETPOLL without engaging the real key-value store(Memcached) in the userspace! In miss cases I only let the request go through the kernel network stack and the Memcached application will respond to the request individually. I only update my hash my with respect the outgoing message in NF_IP_POST_ROUTING. I intended to reduce the latency of the key-value stores' requests at the data centers since these key-value stores are widely deployed in the data center at Facebook and Google.
In my scenario, I only used netpoll as a hack to make my code working though, however, I never figure out, what problem netpoll intended to solve.
Thank you,
Alireza
On Tue, Jul 17, 2018 at 8:21 PM <valdis.kletnieks@xxxxxx> wrote:
On Tue, 17 Jul 2018 18:35:15 +0530, jitendra kumar khasdev said:
> Can netpoll apis send data over the internet. It worked for me in local
> network but when I try to send data over server which is in cloud not able
> to send it.
>
> Can anybody help me out ?
If it works over the local net, time to do the standard network debugging:
Does ping work to/from your cloud target?
Does traceroute look sane?
Does ssh/scp work?
Are your routing tables correct at both ends?
Is a firewall blocking it somewhere?
Does 'netstat' show a program listening for your packets at the far end?
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